John P. Mahoney

Alva C. Mather is a top attorney recognized by Best Lawyers in the practice area(s) of Food and Beverage Law. Alva C., who practices law in Washington, District of Columbia, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alva C. is held by other top lawyers in the same geographic and legal practice area.

Catherine Little counsels clients on energy-related environmental and administrative law at all levels of federal, state and local government, with particular emphasis on regulatory compliance, enforcement defense and administrative adjudication under the Pipeline Safety Act, Clean Water Act (including wetlands) and the Oil Pollution Act. Catherine regularly advises clients with respect to pipeline safety regulatory compliance issues, permitting, spill and release reporting, as well as natura...

David E. Murphy practices litigation including employment, business & commercial litigation, post-employment restrictive covenants, personal and business torts, breach of contract, defamation, severance review and analysis, and executive compensation and termination. David represents clients in both state and Federal courts across Virginia and Washington D.C. David has actively litigated matters from the intake stage through appeal and has significant courtroom experience as a trial lawye...

Sol Wisenberg has four decades of experience serving as lead counsel in complex federal white-collar investigations and jury trials. He represents individuals and businesses facing federal criminal, regulatory, and civil exposure, including matters involving parallel proceedings, fraud-related allegations, and federal sentencing. A substantial part of Sol’s practice focuses on helping clients reduce criminal exposure and avoid indictment during government investigations, civil litigatio...

David L. Miller is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. David L., who practices law in Tysons, Virginia, has been recognized since 2006. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David L. is held by other top lawyers in the same geographic and legal practice area.

Mr. Terpak is one of the premier Eminent Domain Lawyers in Virginia. He is editor of “Eminent Domain Law in Virginia” (2017), and is listed in BEST LAWYERS in the area of Eminent Domain. He has three times been named Best Lawyers LAWYER OF THE YEAR in the DC Metro area in the area of Eminent Domain, most recently for 2018. He has handled many hundreds of eminent domain (or condemnation) cases, including over 40 trials before juries and commissioners in every jurisdiction in Northe...

Brian Nixon’s practice spans advertising, technology, emerging media and privacy, with particular focus on clients implementing targeted advertising strategies and other data-driven marketing initiatives across various media channels. He provides forward-thinking counsel to clients ranging from startups (including social media platforms and emerging media ventures) to Fortune 500 companies. He advises organizations of all sizes on data optimization, mobile commerce, Telephone Consumer P...

Gregory A. Smith is a top attorney recognized by Best Lawyers in the practice area(s) of Native American Law. Gregory A., who practices law in Washington, District of Columbia, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Gregory A. is held by other top lawyers in the same geographic and legal practice area.

Nicholas A. Giannasca is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law. Nicholas A., who practices law in Washington, District of Columbia, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nicholas A. is held by other top lawyers in the same geographic and legal practice area.

Patrick J. Howley is a shareholder in the Firm’s Trusts & Estates Department. His practice focuses on estate planning for individuals and families, as well as representation of fiduciaries in the administration of estates and trusts. Mr. Howley counsels clients on the use of Wills, Revocable Trusts, Financial Powers of Attorney, Health Care Powers of Attorney and Living Wills to accomplish their estate planning objectives. He also advises on the use of advanced techniques designed t...